Wet Flies.
Black and Peacock Spider
If ever a fly defined the tradition of flyfishing for trout then this must be it. As effective and relevant now as it was a hundred years ago.
Partridge and Orange Spider 
The soft hackle provides an irresistable pulsing action when swung across the current.
Invicta
Another traditional pattern that still tempts lake trout and earns it spot in a fly box alongside newer nymph patterns.
Red and Black Zulu
When our modern nymphs fail to deliver, try an older classic like this - you may be in for a surprise.